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Rapid Ph drops

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So I'm in the process of cycling a 5 gallon aquarium (using one nerite snail already in it) and the ph keeps falling. I'll put in water thats right around 7.4, then when I check it the next day it drops to around 6.3. It's done this three separate times, each after a 50% water change. The tank contains black sand (from Petco), some driftwood, an anubias plant, some dwarf hairgrass, and a few ceramic caves and silk plants. Ammonia nitrate and nitrate levels are all ~0. the temperature is 74F/ Any idea whats going on?

Although tannis can lower your pH, I do not believe it would lower the pH this much

My only other thought is the CO2 levels in your water. If you do not have enough surface adjuration to oxygenate the water, the CO2 levels will rise and your pH can drop.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]